Grinding machine



Dec. 31,' 1946. o. T. PIEPER 2,413,334

GRINDING MACHINE Filed June 16, 1943 4 sheets-sheet' 1 De@ 31, 1945. 0.1', PIEPER 2,413,334

GRINDING MACHINE Filed June 1e, 1945 4 sheets-sheet 2 Dec. 3l, 1946. o. T. FlEPER GRINDING MACHINE Filed June 164, 1943 c. 3l, 1946. y O; PlEPER 2,413,334

GRIINDINGk MACHINE Filed June 16, 1943 4 Sheets-Sheet 4 Patented Dec. 31, 1946 GRINDING MACHINE Oliver T. Pieper, Wilmington, Del., assignor to Lobdell Company, Wilmington, Del., a corporation of Delaware Application June 16, 1943, Serial No. 490,965

The present invention relates to grinding machines and more particularly to knife grinding machines.

While the grinding machine of the present invention may be used to grind or sharpen knives of many different types of cutting tools, it is particularly adapted for grinding or sharpening knives` of chippers used for chipping pulp logs or similar purposes. Such knives are now usually ground singly by moving them horizontally/'across a suitable grinding wheel. This method of grinding, while satisfactorywhen only a, few knives have to be ground, is relatively slow and not suitable where large numbers of knives must be ground.

It is accordingly the primary object of the present invention to provide a novel grinding machine for grinding a multiplicity of knives at one setting of the machine.

A further important object is to provide a grinding machine having a rotating turret for holding a multiplicity of knives, with novel means for insuring positioning of the knives to locate their cutting edges in a common plane, whereby they will each travel in a predetermined path across the face of a grinding wheel in response to rotation of the turret.

Another object is to provide a turret type grinding machine with novel adjustable knife supporting chucks for positioning the multiplicity of knives with their cutting edges in a common grinding plane.

A still further object is to provide a turret'I type grinding machine with gauging meansI designed to assure the positioning of each of a multiplicity of knives with their cutting edges in a common plane, and which forms a part of the machine but which may be readily removed out of the way upon conclusion of gauging. n

Another object resides in mounting the grinding wheel of a turret type grinding wheel for movement in novel manner toward or away from the turret, to position the grinding wheel in the path of the knives carried by the turret.

A further object resides in providing a turret type grinding machine, having a knife gauging device, with a novel turret drivingvmechanism including a shiftable member which is automatically movable into non-driving relation when the gauging means is moved into a gauging position, to preclude driving the turret while gauging is being carried out.

A still further object is to provide a turret type grinding machine with a grinding wheel movable radially with respect to the axis of said turret, so-as to bring the axis of the grinding wheel into predetermined intersecting relationship to the path of movement of the knives carried by the turret.

Another object is to provide a turret type knife 15 Claims.

grinding machine having means for passing a multiplicity of knives across the face of a revolving grinding wheel in a manner to cause the face of the Wheel to take successive cuts across the cutting' edge of each of said knives, one with the wheel rotating towardA the knives land another with the wheel rotating away fromthe knives.

. The invention also aims to provide further improvements 'and refinements in the turretgrind-H ing machine art, including the provision of novel drive assemblies for rotating the grinding wheel"` and turret witheitherone or two motors a novelcompact control station in front of the turret from which the blades may be gauged, the wheel adjusted and the turret started and stopped, together with a novel design andarrangement of parts whereby the various operations may be carried out, and further subordinate improvements Y Figure la isa detailed View illustratingl the compound lever 58 of the gauging means of Fig-` ure 1. Y l

Figure 2 is a rear elevational view of the grinding machine of Figure l;

Figure 3'is a front elevational view of the grinding machine of Figure 1;

Figure 4 is a side elevational view of the opposite side ofthe grinding machine shown in liig-I ures 1 to 3; 4

Figure 5 is a transverse sectional view taken substantially on the line 5 5 of Figure-1;

Figure 6 is a iragmental longitudinal sectional view of the grinding wheel and spindle taken sub-V stantially on the line 6-6 of Figure 4;

l.Figu're is a -fragmental plan view of a part cf the mechanism employed for moving the'grinding wheel toward and away from the'turret; Figure 8 is a top plan view of a modied form ofgrinding machine embodying the present invention with certainrparts removed for clarity of:

substantially on' the line lI-ll of Figure 8 with.

the parts omitted in Figure 8 shown in full lines; and

lZ-I2 oi-Fgure 11. I

Figure 12 is ya detailed Vsectional View on line With continued reference to the drawings wherein like reference characters are employed throughout the several views of the drawings to indicate the same parts, a grinding machine made in accordance with the present invention comprises a supporting base B; a turret supporting framework F carried by said base; a turret T rotatably mounted on said framework and designed to move a plurality of knives K or similar work pieces through a circular path; a speed reducing gearing G driven by an electric motor M; a spindle housing H mounted on base B in spaced relation to framework F with its axis parallel thereto; a grinding wheel W and its associated spindle mounted for rotation in housing H with its axis intersecting vthe circular path of knives K; driving means for wheel W consisting of either a separate electric motor M' or a drive shaft D directly connected to the shaft of motor M; Work locating or gauging means L mounted on framework F and designed to be selectively moved into contact with knives K or similar work pieces carried by turret T to locate the knives K or similar work pieces in a common plane; and advancing means A for moving grinding wheel W into grinding position with respect to At-he common plane of knives K or similar work pieces carried by turret T.

Turret and work supports of Figures 1 to 7 Referring for the present to the embodiment of Figures 1 to '7, framework F is secured to base B in any suitable manner and comprises a pair of forwardly and rearwardly spaced, upwardly extending, supporting standards interconnected at their lower ends by a base plate 2| and their upper ends by a supporting sleeve 22. Sleeve 22 rotatably supports a hollow shaft 23, the front end of which non-rotatably supports hub section 24 of turret T and .the rear end of which non-rotatably supports a driven gear 25. Any suitable bearings (not shown) may be employed between sleeve 22 and shaft 23 to assure free rotation of shaft 23 and to take the end thrust of .the shaft. Turret hub 24 is provided with twelve bolt holes arranged in sets of three equally spaced in each quadrant and designed to freely but snugly receive bolts 26 which are threaded into suitably tapped openings in the inner ends 21 of four outwardly extending chuck supporting arms 28. The edges of the outer ends of arms 28 are enlarged at 3| (Figure 1) to provide pivots 32 designed to pivotally receive adjustable work supporting chucks 33.

Each chuck 33 comprises a pair of side plates 34 having a pivot opening to .receive pivots 32 and a slot 35 to freely and slidably receive the shank of lock screws 36 threaded into suitable openings in enlarged portions 3| of arms 28. Adjacent their uppermost edges, plates 34 are interconnected by an integral cross-member or web 31 having an upstanding flange 38 at its innermost end. Intermediate its ends flange 38 is provided with a tapped boss 39 designed to receive a cap screw 4|, the axis of which is parallel to the upper surface of member 31 and slightly spaced therefrom. The upper surfaces of side plates 34 adjacent their outer ends are tapped to receive cap screws 42 designed to secure a clamp bar 43 against work pieces K to secure them in sockets member 31 when clamp bar 43 is loosened. Such movement is effected by cap screws 4| threaded into bosses 39 and abutting the inner end of work pieces K. By this means, work pieces K are brought into position for grinding with their ground surfaces in a common plane.

To assure the proper positioning of each Work piece K, the gauging means L about to be described is used. Means L is pivotally mounted on a shaft 5| having its ends pivotally mounted in spaced arms 52 of a bracket 53 fastened in any suitable manner to a flat supporting base 54 integrally formed on sleeve 22 and comprises a standard 55 non-rotatably mounted on shaft 5|. The axis of shaft 5| is disposed at right angles to the axis of shaft 23 and is retained in its right angular relationship by the spaced arms 52. At its upper end, arm 55 is provided with a dial gauge 56 having a vertically extending contact arm 51 adapted to slide axially in the casing of gauge 56. Arm 51 is operatively connected through suitable gauge mechanism (not shown) to the dial of gauge 56 so as to operate gauge 56 in accordance with the axial position of arm 51. Since the details of gauge 56 form no part oi the present invention and may vtake any suitable form apparent to those skilled in the art, a detailed description thereof will not be given in this application.

Operation of gauge 56 is effected through a compound lever 58 pivoted at 59 on standard 55 (Fig. 11). A coil spring 6| having one end secured to arm S2 of lever 58 (Figure 1A) and the other end to a pin 63 carried by standard 55 normally biases lever 58 in a clockwise direction into engagement with a stop pin 64 mounted on standard 55. Referring to Figure 1A, the other arm 65 of lever 6| is provided with a ztapped opening 66 designed Ito 4threadedly receive a contact pin G1 adapted to engage the ground surfaces of the work pieces when standard 55 is in its operative position as shown in Figures l and 2.

Between contact pin 61 and shaft 5|, standard 55 is provided with a pair of spaced L-shaped brackets 68 equally spaced transversely of a vertical plane containing the axis of shaft 23. As clearly shown in Figures 1 and 3, brackets 68 span chucks 33 and retain turret T in position with one of its arms 28 vertically disposed when standard 55 is in its operative position and prevent inadvertent rotation of the turret during adjustment of the Work piece carried by the vertical arm. An adjustable stop screw 10 threaded into standard 55 and extending toward turret T into abutting engagement with the underside of web 31 of chuck 33 locates standard 55 in the same vertical angular position with respect to chucks 33 to assure proper setting of each knife K in a set to be ground.

While any suitable means may be provided for moving standard 55 from its operative position to its inoperative position, this movement is preferably effected by a rock lever 1| keyed to shaft 5| at 12 so that movement of lever 1| about the axis of shaft 5| causes a corresponding movement of shaft 5| and standard 55. Lever 1| is preferably provided with a spring pressed pawl 13 pivoted on lever 1| and biased in a counterclockwise direction by a spring 14 surrounding a trip shaft 15 one end of which is pivoted to the outer end of pawl 13 and the other end of which is pivoted on a hand operated trip lever 16 pivotally mounted adjacent the upper end of lever 1|. Pawl 13 cooperates with a ratchet arm 11 integrally formed on bracket 53 and provided with three equally spaced notches 18 (Figure 1), the one at the left retaining standard 55 in operative position with respect to turret T, the center one retaining standard 55 in an intermediate position but non-cooperative position with respect to turret T and the right hand one retaining standard 55 in its inoperative position.

During adjustment of knives K, rotation of turret T by motor M is disrupted so that turret T4 may be manually rotated step-by-step to successively position each arm 28 in cooperating relation with brackets 69. While any suitable mechanism for accomplishing this end may be employed, the present embodiment of the invention contemplates an automatic lockout mechanism, to be hereinafter described in detail, operable upon movement of lever '1| and standard 55 to the intermediate position with pawl 13 in the center notch 18 of ratchet arm 11.

Grinding wheel and spindle construction of Figures 1 to 7 Grinding wheel W may take any suitable form but preferably comprises a cup wheel having its cup face toward turret T and its axis parallel to hollow shaft 23 and substantially intersecting theA path of movement of knives K. Referring particularly to Figure 6, Wheel W is preferably piloted on an annular flange 8| formed on a radial flange 82 of a hub 83 and is clamped against a radial face 84 of flange 82 by annular clamp plate 85 drawn into clamping engagement by cap screws 86 passing freely through anges 8| and 82 and threaded into suitably tapped apertures in clamp plate 85. Hub 83 is keyed on the tapered end 81 of a spindle 88 and held againstaxial movement by a nut and washer assembly 83. Spindle 88 is rotataby supported adjacent its opposite ends in spaced combined radial and end thrust bearings 39 and 90, such as Timken tapered roller bearings, mounted in spindle housing H with their inner axial faces of their outer races abutting spaced, inwardly extending, annular flanges 9| formed in housing H. Bearing 89 has a forced fit on spindle 88 so that a nut 92 threaded on spindle 88 and abutting against the innei race of bearing 90 will take up end play in spindle 88 and bearings 89 and 90.

The opposite ends of spindle housing H are closed by co-ver plates 33 secured to housing H by cap screws 94. Cover plates 93 are provided with oil seals 35 adapted to engage spindle 88 and prevent loss of lubricant from a lubricant reservoir 96 provided in housing H between annular anges 9|.

The other end 31 of spindle 88 is reduced in diameter and provided with a belt pulley 98 which is keyed to spindle 88 at 99 and retained against axial movement by nut and washer assembly |00. A suitable wheel guard carried by housing H and provided with an arcuate opening 82 having the axis of turret T for a center encloses Wheel W and permits knives K to pass across wheel W in grinding contact during operation of the machine.

While spindle housing H may be mounted in any suitable manner on base B, it is preferably mounted so as to be adjustable axially and radially with respect to turret T. To this end, housing H is carried by a pair of axially spaced, up-standing pillars |03 and |04 which are bolted to a transversely slidable base by bolts |08 (Fig. 4). Each of said pillars has an upwardly opening, semi-annular, seat |01 for slidably `receiving housing H and a complemental, semiannular, cap |08, which is designed to retain housing H on seat |01 upon tightening cap screws |09 carried by flanges i l of cap |08 and threaded into flanges |52 of pillars |03. Cap |08 and pillars |03 and 04 are so designed that tightening of screws |09 will not bind housing H. As a consequence, housing H, spindle 88 and wheel W may be slid axially along seats |07 to bring the cup face of wheel W into grinding relation to knives K after the knives have been brought into proper grinding position in chucks 33 by the means previously described without leaving the front of the machine.

While this axial movement may be elected in any suitable manner, the present invention contemplates advancing means A operable from the front of turret T. To this end, pillar |03 is provided with an elongated boss H3 adapted to receive a supporting bracket ||4 secured thereto in any suitable manner. Bracket I|4 provides a pair 'of right angularly disposed, upwardly extending arms ||5 and I|6 terminating in journal supports ||1 and ||8 having their axes at right angles (Figs. o-7).

Support ||1, as clearly seen in Figure '1, journals the unthreaded portion I9 of a lead screw |2| which isheld against axial movement therein by a positioning collar |22 and the hub of a bevel gear |23 non-rotatably mounted on the end of screw |2| and held against axial movement by nut |24 threaded on the end of screw l2 I. The opposite end of lead screw |2| is threadedly engaged in a threaded opening |25 formed in the lower section |26 of a two part collar |21 embracing housing H so that rotation of lead screw |2| feeds said collar and housing along screw |2|. The upper mating or cap section |28 of collar |21 is operatively associated with section |26 by cap screws |29 freely passing through apertures |3| in flanges |32 of lower section |26 and threadedly engaging in tapped apertures (not shown) in flanges |33 of upper section |28 so that upon tightening of screws |29 collar |21 Will be nonmovably clamped to the end of housing H.

Meshing with gear |23 is a bevel gear |34 nonrotatably secured to one end of a shaft |35 journalled in support 8 so that the axes of gears |23 and |34 are at right angles. Shaft |35 is non-rotatably but slidingly associated with a bevel gear |36 through a keyway |31 extending from the opposite end of shaft |35 to a point adjacent support 8 and a suitable key |38 in the hub |39 of gear |36. A suitable nut |4| threaded on hub |39 secures gear |36 against axial movement in a journal bracket |42 carried by a gear shield |43 surrounding gear 25 and carried by a suitable frame member |44 extending upwardly from base B (Figure 1).

Gear |36 in turn meshes with a bevel gear |45 carried by a shaft |46 suitably journalled in hollow shaft 23 and extending forwardly beyond turret T and provided with a suitable handwheel |41 accessible to an operator standing in front of turret T. From the foregoing description, it will be clear that after the operator has made the necessary adjustments of knives K carried by turret T from the front of turret T, he can then grasp handwheel |41 and rotate it in the desired direction to cause axial movement of housing H, spindle 88, wheel W and guard |01 through rotation of shaft |46, bevel gears |45 and |36, shaft |31, bevel gears |34 and |23 and-lead screw 2| cooperating kwithv collar |21 so as to dispose wheel W in proper grinding position as determined by the adjustment of knives K.

While rotation of housing H in seats |01 would be resisted to a certain extent by collar |21 and lead screw |2I, further means for resisting this rotation is deemed desirable. To this end, a twopart collar |5| is tightiy secured on the housing and is made up of a cap section |52 and a lower section |53 having a depending portion |54 terminating in an elongated, transversely disposed base |55 having sliding contact with base |05 and a key |56 on base |55 cooperating with a longitudinally extending keyway |51 in base I 05 is provided. Due to key |56 and the wide contact with base |05, collar |5| will adequately serve to resist rotation of housing H and at the same time positively guide it in its axial movement.

Radial movement of wheel W, spindle 88 and base |05 with respect to turret T is also provided to assure proper positioning of the axis of wheel W with respect to the path of movement of knives K. This movement is accomplished by mounting base |05 for transverse sliding movement on base B. To this end, base B is provided with T slots 58 which receive T bolts |59 carried by base |05 and a rack and pinion feed mechanism of conventional design is disposed between base B and base |05. As shown in Figure 4 this mechanism includes a, shaft |60 mounted in the base |05 and carrying a pinion at its inner end as shown in dotted lines, in mesh with the toothed rack |60 suitably fixed to the base B. It is sucient that the T slots |58 and rack be positioned normal to the axis of spindle 88 to assure proper movement of base |05 and its associated mechanism.

Since this adjustment is infrequently required, access to the pinion shaft is provided at the rear of the machine as clearly indicated by reference to Figures 2, 4 and 5.

Turret and wheel drives of Figures 1 to 7 While any suitable driving means may be provided for turret T and wheel W, this form of the invention contemplates an electric motor M and speed reducing gearing G for driving turret T and a second electric motor M for driving Wheel W.

Referring to the turret driving means, a driven shaft |6| having a hollow end journalled at |62 in rear standard of framework F and its other end journalled in end wall |63 of gear case |64 is provided. A pinion gear |65 meshing with gear is journalled on shaft |6| and carries an integral dog clutch member |66. Clutch member |66 is designed to cooperate with a shiftable clutch member |61 slidably but non-rotatably mounted on shaft |6|. Clutch member |61 is shiftable from its inoperative position shown in Figure 1 to its operative position in engagement with member |66 by means of a shifter rod |68 extending into the hollow end of shaft |6| and provided at one end with a key |69 slidably mounted for axial movement in way |1| of shaft ISI and rigidly connected at its ends to clutch member |61.

While shifter rod |68 may be actuated in any suitable manner, the present invention contemplates connecting shifter rod |68 to shaft 5| so that operation of lever 1| automatically shifts clutch member |61 to its operative or inoperative position as gauging means L is moved toward and from its gauging position. To this end, the protruding endof shifter rod |685 is provided -with a suitable yoke |12 looselyswivelled on'rod |68 and designed to cause axial movement of rod |68 but permitting free rotation of rod |68 with respect to yoke |12. Yoke |12 is adjustably connected to a clevis |13 by a threaded rod |14 and clevis |13 is pivotally connected at |15 to a rock arm |16 non-rotatably carried by a rock shaft |11 journalled in a bracket |18 mounted on base 2| of framework F. An angularly disposed rock arm |10 is also non-rotatably connected to rock shaft |11 and is pivotally connected at |8| to a link |82 which is connected to a rock lever |83 non-rotatably mounted on shaft 5|. The levers 1|, |16, |19, |83 and link |82 are so proportioned that counterclockwise movement of lever 1| from its extreme right hand position as viewed in Figure l to its intermediate position disengages clutch member |61 and disables the drive to turret T. Further counterclockwise movement of lever 1| to bring gauge means L into operative position merely moves member |61 further witho'ut any effect upon the driving connection between shaft |5| and gear |65.

Shaft |6| is driven by gear |84 mounted on the end of shaft |6| and meshing with a pinion |85 (Figure 2) secured adjacent one end of a countershaft |86 journalled in walls |63 and |81 of gear case |64. At its other end countershaft |86 is provided with a gear |88 which meshes with a drive pinion |89 suitably secured to a drive shaft |9| which derives its power from motor M through drive pulley |92 mounted on motor shaft |93, belt |94 and pulley |95 mounted on drive shaft ISI. While any suitable belt drive may be employed, it is preferable to use a V-belt drive like that illustrated in detail in Figure 4 wherein the belt drive for wheel W, to be presently described, is illustrated.

Shaft |9| is also preferably provided with a pulley |96 which is designed to drive a coolant pump (not shown), which forms no part of the present invention, through belt |91, pulley |98 and shaft |99. It is to be understood that any other suitable coolant supply system may be employed ard that pulleys |96 and |88, belt |91 and shaft |99 may be omitted without departing from the present invention.

Variation of the tension on belt |94 is obtained by counterclockwise movement of motor M and its supporting base 20| around the axis of motor pivot 202 carried by upstanding ears 203 formed on cover 204 of casing |64. A set screw 205 threaded into an upstanding boss 206 on cover 204 affords means 4for securing the desired counterclockwise movement around the axis of motor pivot 202 and retaining the desired adjustment.

To assure positive drive of wheel W in all of its adjusted positions, the present embodiment of this invention provides a separate motor M carried by housing H so as to be movable as a unit with the housing. This is accomplished by providing cap sections |28 and |52 of collars |21 and |5| with upwardly extending arms 201 designed to receive a pivot rod 208 and oppositely disposed outwardly and upwardly extending arms 200 the outer ends of which are interconnected by a strap 2 I0 secured to arms 209 by cap screws 2| I. Intermediate its ends strap 2|0 is provided with an upwardly extending stop screw 2i 2 threaded into strap 2|0 and a boss 2|3 formed on the under surface of strap 2|0. A reinforcing web 2|4 extends in opposite directions from boss 2| 3 toward the ends of strap 2|0.

A motor supporting base 2 I5 carrying motor M is pivoted on -rod 203 and extends across hous- 9.. ing H into abutting relation to stop screw 2l2 (Figures 2 and 5). A belt pulley 2 6 having three V-shaped grooves 2|1 is mounted on the shaft 2|8 of motor M. The V-belts 22| disposed in grooves 2 I1 of pulley ZIB and similar grooves 222 in pulley 93 connect motor M to spindle 88. The tension of belts 22| is adjusted by manipulation of stop screw 212 in well known manner.

From the preceding description, it will be clear that motor M', spindle 88, pulleys 2|6 and 222 and housing H move as a unit upon axial or transverse adjustment of wheel W and that the driving relationship between motor shaft 2|8 and spindle 88 is not disturbed by such adjustments. Since operation of this embodiment of the invention is believed clear from the preceding description, a detailed description of operation at this point is not believed necessary.

Upon reference to Fig. 3 of the drawings, it will be noted that the internal diameter of the annular grinding surface of the wheel W is greater than the length of the work piece K, and that in the continuous traverse of the work piece diametrically of the wheel, the grinding action of said surface in one direction is fully completed before the grinding action in the opposite direction starts, with a maximum period of contact between the grinding surface and the work. This is of particular importance in the grinding of cutting tools, as it obviates possible distortion of the cutting edge and assures uniform wear of the grinding surface. With the cutting edge of the tool moving across the grinding surface substantially radially thereof, all parts or said surface contact the cutting edge in each direction of movement of said surface relative to the tool. By properly synchronizing and controlling the relative speeds of rotation of the wheel and turret, a rapid and highly eicient grinding action may thus be obtained with the use of a grinding wheel of minimum diameter.

The lateral adjustment of the grinding wheel with respect to the turret is also an important feature, as such adjustment enables the angle of contact between the work and the annular grinding surface of the wheel to be varied in relation to a vertical plane which includes the wheel axis.

Turret .and work supports of Figures 8 to 12 Referring to Figures 8 to 12, this embodiment of the invention is substantially the same as that previously described and the same reference numerals are employed to designate the same parts, a detailed description thereof being omitted.

In this embodiment of the invention, framework F differs from that previously described only in the provision of a further supporting base 23| on sleeve 22, spaced rearwardly from base 54 for a purpose to be hereinafter pointed out. Sleeve 22 rotatably supports hollow shaft 23 which in turn carries hub section 24 of turret T at its front end and gear 25 at its rear end. While no bearings are shown in Figure 11 between sleeve 22 and shaft 23, it will be appreciated that suitable bearings may be employed, if desired, without departing from the present invention.

Hub 24 in this embodiment of the invention is connected to the inner ends 21 of four outwardly extending arms 28 provided with integrally formed chucks 33a. As clearly seen in Figure 12, chucks 33a comprise upwardly extending side flanges 234 and a body section 231. The upper surfaces of flanges 234 adjacent their outer ends are tapped lo to receive cap screws 42 for securing clamp bar 34 against work pieces K to secure the work pieces in the sockets formed between flanges 234 and body section 231 substantially in the manner work pieces K are secured in the sockets formed by side plates 34, member 31 and ange 38. The socket of this embodiment, however, embodies automatic means, in the form cf steel balls 238 and aligned spring pressed plungers 239, for aligning the work pieces in the sockets. As clearly seen in Figure 12, balls 238 are secured in spherical ended bores 24| in flanges 234 by cap screws 242 having spherical sockets in their enos and plungers 23S` are slidably mounted in aligned bores 243 the outer ends of which are threaded to receive cap screws 244 having a spring receiving recess in their inner ends. A coil spring 245 housed in the interior of plungers 239 and in the recess in screw 244 urges plungers 239 toward balls 238 the extent of movement being limited by engagement of shoulders 246 and 241 formed respectively on plungers 238 and flange 234. Cap screw 4| in this form of the invention is threaded into an arm 248 integrally formed on the body of hub 24 and extending outwardly from its front face. While the angularity of chucks 33a cannot be Varied in this form 0f the invention, selection of suitably formed chucks 33a permits the angularity of the ground surfaces of Work pieces K to be predetermined.

The gauging means L of this form of the invention diners from that previously described in that arm a corresponding to arm 55 is carried by a pivot 249 carried by transversely spaced arms 250 and 25| of bracket 53a. Arm 25| provides a sleeve-like journal 252 designed to rotatably support a rock shaft 51a. Rock shaft 5|a in this form of the invention is a stub shaft having a crank arm I83a, slightly longer than arm |83 previously described, at its far end as viewed in Figure 11.

Lever 1| is non-rotatably secured to the nearer end of rock shaft 5|a and carries trip lever 16, trip shaft 15 and pawl 13 designed to cooperate with a ratchet arm 11a, formed as an extension of arm 25|, in the manner previously described. Crank arm |8311 at its outer end carries a pivot pin 253 the purpose of which will be hereinafter 50 pointed out.

At a point approximately intermediate its ends arm |83a is pivotally connected at 253a to a rod 254 the upper end of which is slidably mounted ing as an abutment for a coil spring 258 which reacts against ball and socket connection 255 to resiliently urge lever 55a in a counterclockwise direction around pivot 249 as lever 1| and rock shaft 51a are rotated in a counterclockwise direction to bring arm 55a into its operative position. Nuts 251 are disposed on the end of rod 254 in abutting relation to ball and socket connection 255 and serve to adjustably predetermine the relative angular position between arm 55 and crank arm |83a to assure proper positioning of gauging means L upon actuation of lever 1|.

Adjustment of work pieces K is accomplished in substantially the same manner as previously described, the only difference resulting from the diiferences in details just described.

11 Grinding wheel and spindle construction lof Figures 8 to 12 Grinding wheel W of this form of the invention is mounted on a hub 93a in substantially the same manner as previously described and a detailed description will, therefore, be omitted. Hub 83a, however, is keyed to the end 81a of a spindle 88a which also constitutes the shaft of motor M serving to drive wheel W and turret T.y To effect this end, motor M is carried by sleeves 26| and 262 which together constitute housing I-I of this form of the invention and slidingly engages base B at 260 on opposite sides to prevent rotation of the motor and sleeves 26| and 262.

Referring'to Figure 9, spindle 88a is suitably journalled in housing H by a pair of spaced antifriction bearings (not shown) one of which is located adjacent hub 83a and the other of which is located at the end 263 of motor M. Sleeve 26| is slidably supported by a pillar 264 mounted on base B and having a cap section 265 bolted ther to to hold sleeve 26| in sliding position on pillar 264. Sleeve 262 at its right hand end, as viewed in Figure 9, is provided with a screw vthread 265 designed to cooperate with a nut thread 261 formed at the end of a sleeve 268 journalled in a socket formed by a pillar 269 mounted on base B and a cap section 21| bolted to pillar 269. Axia1 movement of sleeve 268 with respect to pillar 239 and cap section 21| is prevented by flange 212 integrally formed on sleeve 263 and the hub of sprocket wheel 213 fixed to sleeve 268 and which is held in place by a nut 214 threaded on the end of sleeve 268.

The end 215 of spindle 63a is provided with a relatively long keyway 216 and is telescopically received in a hollow shaft section 211 which has an integral mating key 218 formed at its inner end for sliding cooperation with keyway 216. At its other end shaft 211 is supported by an antifriction bearing (not shown) housed in extension 219 Yof' a housing 28| threaded on the end of sleeve 263. Adjacent extension 219 shaft 211 is provided with a pulley wheel 282 which is keyed to shaft 211 at 293 and held against axial displacement by nut 234.

From the foregoing description, it will be clear that motor M, sleeves 26| and 292, end 215 of spindle 88a and wheel W are caused to move axially as a unit with respect to base B, pillar 264, sleeve 268 and shaft section 211 upon rotation of sleeve 268 but that the rotational driving connection between spindle 83a and shaft section 211 is not affected. This axial movement is for the same purpose as that previously described and may be effected from the front of the machine by rotation of hand wheel |41 and shaft |46a, which in this form of the invention is slightly longer than its counterpart of Figures 1 to 7, is provided with a sprocket wheel 285 rather than bevel gear and is held against axial movement in any suitable manner. A sprocket chain 286 (Figures 8 and l0) interconnects sprocket wheels 213 and 236 to effect rotation of sleeve 268 and the desired axial adjustment of wheel W.

Turret and wheel drives of Figures 8 to 12 Turret T in this embodiment of the invention is driven by motor M through end 215 of spindle 88a, shaft section 211, pulley wheel 282, a belt 29|, a speed reducing pulley 292, speed reducing gearing G and a shiftable gear 293 adapted to be selectively engaged with gear Speed reducing gearing G of this embodiment comprises a pinion 294 mounted on a shaft 295 which also carries pulley 292 and a gear 296 mounted on a shaft 291 which also slidably carries pinion 293. Shaft 295 and one end of shaft 291 are journalled in suitable anti-friction bearings (not shown) mounted in a bracket 298 secured to base B and the other end of shaft 291 is mounted in suitable anti-friction bearings (not shown) 0 mounted in a bracket 299 secured to base B.

Pinion 293 is operated by a shifter lever 30| disposed at the front of turret T on a hollow, axially slidable, shifter tube 362 interposed between shafts 23 and |46 and provided at its inner 5*' end with a shifter yoke 3D3 designed to cooperate in well known manner with a yoke groove 394 formed in the hub 305 of gear 293.

Automatic means for preventing connection of the turret drive during adjustment of the work pieces in this form of the invention comprises a block 366 having an upwardly extending arm 361 pivotally connected at 398 to a rocker arm 369 pivoted intermediate its ends to a bracket 3| mounted on base 23| of sleeve 22. The opposite end of rocker arm 309 is pivotally connected at 3i2 to a link 3|3 carried by pivot pin 253 of crank arm i33u. Operation of this lock-out means is automatically effected upon actuation of lever 1| to bring gauging means L into operative position.

This automatic lock-out means also prevents an operator from moving gauging means L into operative position until shifter tube 362 has been actuated to shift pinion 293 to its disengaged position, since block 396 would be arrested in its movement by shifter yoke 363 and through arm 361, rocker 369, link 3|3, clank arm |83a and shaft 54a, would prevent further movement of lever 1|.

The invention may be embodied in other specic forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

What is claimed and desired to be secured by United States Letters Patent is:

1. A grinding machine comprising a rotatable turret having a series of relatively fixed chucks for supporting a plurality of work pieces, each 55 chuck having means for adjusting a work piece to position the surface to be ground along the aXis of the turret, micrometer means common to the series of chucks mounted for movement from an operative position to an inoperative position adjacent an individual chuck, means for positioning said micrometer means for gauging the position of thework pieces and locating said surfaces in a common plane for grinding, means for rotating said turret, control means for said turret rotating means operatively connected with and actuated by said micrometer positioning means, and a grinding wheel having its grinding surface disposed adjacent to the path of movement of the work pieces for grinding said surfaces thereof.

2. In a grinding machine having a revolving turret for supporting work pieces to be ground and a revolving grinding wheel, means for driving said turret and said grinding wheel; means movable into the path of said work pieces for 75 gauging the position of said work pieces `and assuring positioning thereof in a common plane;

a shiftable drive element for starting and stopping said turret; and means for automatically locking said drive element against shifting, to prevent starting of said turret until said gauging means is moved out of the path of said work pieces.

3. In a grinding machine having a revolving grinding wheel and a revolving work supporting turret, a micrometer support mounted for movement toward and away from said work supporting turret; an abutment on said support adapted to contact said turret for stopping said micrometer support in predetermined position; and a micrometer gauge supported by said support for gauging the position of said work.

4. A grinding machine, comprising a supporting framework; a hollow shaft supported for rotation in said frame-work; a revolving work supporting turret carried by said shaft; adjustable work holding chucks carried by said turret for gripping and positioning work pieces in a common plane; a sleeve-like housing disposed in spaced parallel relationship to said hollow shaft and supported on said frame-work for axial movement toward and away from said common plane; a second shaft rotatably mounted in said housing; a grinding wheel carried by said second shaft and having a radial grinding face; a motor connected to said second shaft for driving said grinding wheel; and means passing through said hollow shaft and operably connected to said sleeve-like housing for axially sliding said housing, said second shaft, said grinding wheel and said motor, to bring said grinding wheel face into said common plane for grinding said work.

5. The combination dened in claim 4, together with means, connected to said motor, for driving said hollow shaft and said turret in all axially shifted positions of said motor.

6. The combination deiined in claim 4, together with means, including a shiftable control element, connected to said motor, for driving -said hollow shaft and said turret in all axially shifted positions of said motor, and means is provided for shifting said control element to selectively connect and disconnect the drive from said motor to said turret.

7. The combination defined in claim 4, wherein said motor, said sleeve-like housing and said second shaft are mounted on an auxiliary supporting base mounted for sliding movement normal to the axis of said turret, whereby the axis of said grinding wheel may be selectively positioned various distances from said turret, for varying the path .of movement of said work across the face of the wheel.

8. A grinding machine comprising a hollow shaft; a revolving work supporting turret mount- Ied on said shaft; means, including a driving member shiftable into and out of driving engagement, for driving said shaft and said turret; work supporting chucks mounted on said turret and operable to hold work in a predetermined plane for grinding; a grinding wheel shaft mounted in spaced parallel relationship to said hollow shaft; a grinding wheel mounted on said shaft; means mounting said grinding wheel shaft for axial movement to advance said grinding wheel into said grinding plane; and means, extending through said hollow shaft and terminating in an operating station adjacent the front of the turret, for engaging and disengaging said driving member and for advancing said grinding wheel into said grinding plane.

9. A grinding machine comprising a supporting frame-work; a hollow, revolving work supporting turret rotatably mounted on said frame-work; work holding chucks carried by said turret for gripping and positioning work pieces to be ground; a sleeve-like housing disposed in spaced parallel relation to the axis of said turret and supported on said frame-work for axial movement toward or away from said chucks; a grinding wheel carriedby said housing and having a grinding wheel face; a motor carried by said housing; means for moving said housing, said grinding wheel and said motor axially along said frame-work to bring said grinding wheel face into position to grind work pieces in said chucks; means drivingly connecting said motor to said grinding wheel; and means connecting said motor to said turret to drive said turret in all axially shifted positions of said housing, said grinding wheel, and said motor.

10. The combination deiined in claim 9, wherein said last-named means comprises a hollow shaft section slidably but non-rotatably connected to said motor shaft; a drive pulley carried by said hollow shaft section; a driven pulley mounted to drive said turret; and a pulley belt interconnecting said drive pulley and saiddriven pulley.

11. The combination defined in claim 9, wherein said means for moving said housing, said grinding wheel and said motor comprises a sleeve iournalled on said frame-work and threadedly associated with said housing; a sprocket Wheel non-rotatably mounted on said sleeve; a shaft coaxially arranged with respect to said turret and extending outwardly in front of said turret; a hand wheel for rotating said shaft; a second sprocket wheel carried by said shaft; and a sprocket chain interconnecting said sprocket wheels.

12. In combination with a grinding stone, a movable work holder and operating means therefor, gauge means having a part to contact the work to determine its position relative to a grinding face of the stone, a movable support for said gauge means, means for moving said support to dispose said gauge means in operative or inoperative position, and means connected with and responsive to actuation of said last named means to move the gauge means to its operative position, to render said operating means for the work holder inoperative.

13. The combination defined in claim 12, together with means coacting with a part of said last named means in the operative condition of said work holder operating means, to lock said support and gauge means in inoperative position with respect to the work holder.

14. In combination with a movable work holder for a grinding machine, gauge means, means for adjusting said gauge means to and from operative position with relation to the work, and means rendered effective by the relative movement between the gauge means and work holder to cooperative position, to lock the work holder against movement relative to the gauge means.

15. The combination defined in claim 14, in which said last named means comprises a member xed to a part of said adjusting means and movable therewith into and out of coacting engagement with the work holder.

OLIVER T. PIEPER. 

